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Power converting device with inverter circuitry for driving multiple-phase variable-speed motor

  • US 5,373,436 A
  • Filed: 06/30/1992
  • Issued: 12/13/1994
  • Est. Priority Date: 07/01/1991
  • Status: Expired due to Term
First Claim
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1. An electric power conversion device for supplying a load with a continuously variable current, said device comprising:

  • an output section of bridge circuitry adapted to be coupled to the load, said output section including a series circuit of a first switch device and a second switch device;

    first drive means connected to said first switch device, for electrically driving the same, said first drive means having a charge storage device coupled to said first drive means to be charged when said second switch device turns on;

    second drive means connected to said second switch device for electrically driving said second switch device; and

    control means connected to the first and second drive means, for (i) causing, during a designated period, said first drive means to supply said first switch device with a pulse signal which is modulated in its pulse width at a desired index of pulse width modulation to drive said first switch device in a pulse width modulation to drive said first switch device in a pulse width modulation control manner, thereby to provide said load with a suitable current corresponding to the index of pulse width modulation, for (ii) providing said second switch device with at least one pulse which is reverse in phase to said pulse signa to force said second switch device to turn on during the period, thereby charging said charge storage device and (iii) for further charging said charge storage device during a period a non-conductivity of said respective first and second switch device.

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